Lead corrosion inhibitor is necessary for water services utilizing lead-containing service
lines. Stannous chloride is a new corrosion inhibitor that can be used in a distribution system to
depress the lead pipe corrosion. The application of low level stannous chloride (0.125 mg/L as
Sn) in water as a corrosion inhibitor not only avoids the addition of phosphate, which is an essential
nutrition to bacteria, but its toxicity can also inhibit drinking water bacterial activities or even
inactivate some bacteria while being safe for humans. Heterotrophs such as Escherichia coli.
and Pseudomonas aeruginosa are susceptible to Sn toxicity, and autotrophs such as
Nitrosomonas europea, was less susceptible to Sn toxicity. In a laboratory test, the oxygen
uptake rate of a P.aeruginosa batch in 1.0 mg/L SnCl2 decreased by 30% to 50%, and the oxygen
uptake rate of a E.coli batch decreased almost a magnitude in 2.0 mg/L SnCl2. However, the
oxygen uptake rate of N. europea had no significantly change in 2.0 mg/L SnCl2. Sn-contact
experiment was conducted also to test the viability of bacteria. In 1.0 mg/L SnCl2, 20 minutes
inactivation rate ranged from approximately 60% to 95% at low bacterial concentration (<106
CFU per mL) suspensions for these two heterotrophs. And the 20 minutes N.europea inactivation
rate appeared to be insignificant. Includes 11 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 200 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 8 |
| Published : | 11/01/2007 |
